Choose Home tab→Solids group→Rounds list→Chamfer Equal Setbacks 
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On the Chamfer QuickBar, specify the selection method for the chamfer.
Select one or more part edges.
Tip:
If you set the Select type to Face or Loop, you are prompted to select a face or a face that contains loops.
(Optional) Type a value for the chamfer.
Right-click to place the chamfer.
